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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2023
Intangible Assets, Net |
Intangible Assets, Net | Note 10. Intangible Assets, Net The following table summarizes intangible assets, net as of September 30, 2023 and December 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ | ​ | ​ | ​ | Accumulated | ​ | ​
(Thousands) |  | Cost |  | Amortization |  | Net
Customer relationships | ​ | $ | 148,648 | ​ | $ | (24,560) | ​ | $ | 124,088
Favorable lease asset | ​ | ​ | 790 | ​ | ​ | (345) | ​ | ​ | 445
Software | ​ | ​ | 1,058 | ​ | ​ | (529) | ​ | ​ | 529
Intangible assets, net | ​ | $ | 150,496 | ​ | $ | (25,434) | ​ | $ | 125,062
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | Accumulated | ​ | ​
(Thousands) |  | Cost |  | Amortization |  | Net
Customer relationships | ​ | $ | 148,648 | ​ | $ | (18,778) | ​ | $ | 129,870
Favorable lease asset | ​ | ​ | 710 | ​ | ​ | (140) | ​ | ​ | 570
Software | ​ | ​ | 919 | ​ | ​ | (473) | ​ | ​ | 446
Intangible assets, net | ​ | $ | 150,277 | ​ | $ | (19,391) | ​ | $ | 130,886
​ Amortization expense of intangible assets was $2.0 million and $6.0 million for the three and nine months ended September 30, 2023, respectively, and amortization expense of intangible assets was $1.7 million and $5.0 million for the three and nine months ended September 30, 2022, respectively. As of September 30, 2023, the weighted average useful life for definite-lived intangibles is approximately 20 years.

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